import java.io.*;
import sun.net.ftp.FtpClient;


public class Download {

  public static void main(String[] args) {

    FtpClient fc;
    String filename = "";
    String hostname = "";
    String username = "anonymous";
    String password = "";
    String directory = "";

    try {
      int lastSlash = args[1].lastIndexOf('/');
      filename = args[1].substring(lastSlash+1);
      directory = args[1].substring(0,lastSlash);
      hostname = args[0];
    }
    catch (ArrayIndexOutOfBoundsException e) {
      System.err.println("Usage: java Download host path/file username password");
      System.exit(1);
    }

    try {
      username = args[2];
    }
    catch (ArrayIndexOutOfBoundsException e) {
      username = "anonymous";
    }

    try {
      password = args[3];
    }
    catch (ArrayIndexOutOfBoundsException e) {
      password = username + "@";
    }

    try {
      fc = new FtpClient(hostname);
      fc.login(username, password);
      fc.binary();   
      fc.cd(directory);
      InputStream theFile = fc.get(filename);
      int i = 0;
      FileOutputStream fos = new FileOutputStream(filename);
      while ((i = theFile.read()) != -1) {
        fos.write((byte) i);
      }
     fc.closeServer();
     fos.close();
    }
    catch (IOException e) {
      System.err.println(e);
    }

  }

}